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AGWA 3.x - AbstractEPA/600/C-13/148

Notice: Although this work was reviewed by EPA and approved for publication, it may not necessarily reflect official Agency policy. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.

The Automated Geospatial Watershed Assessment (http://www.epa.gov/nerlesd1/land-sci/agwa/ and http://www.tucson.ars.ag.gov/agwa exit EPA) tool is a GIS interface jointly developed by the U.S. Environmental Protection Agency, USDA-Agricultural Research Service, University of Arizona, and University of Wyoming to automate the parameterization and execution of the Soil Water Assessment Tool (SWAT) and Kinematic Runoff and Erosion (KINEROS2) hydrologic models. By employing these two models AGWA can conduct hydrologic modeling and watershed assessments at multiple time and space scales. AGWA uses commonly available, national, GIS data layers to fully parameterize, execute, and visualize results from both the SWAT and KINEROS2. Through an intuitive interface the user selects an outlet from which AGWA delineates and discretizes the watershed using a Digital Elevation Model (DEM). The watershed model elements are then intersected with soils and land cover data layers to derive the requisite model input parameters. The chosen model is then run, and the results are imported back into AGWA for visual display. This allows managers to identify potential problem areas where additional monitoring can be undertaken or mitigation activities can be focused. AGWA can difference results from multiple simulations to examine relative change over a variety of input scenarios (e.g. climate/storm change, land cover change, present conditions and alternative futures). Both AGWA 3.x for ArcGIS 10.x and the existing AGWA 1.5 for ArcView 3.x are available to reach the broadest user audience possible. AGWA 3.x utilizes new features in ArcGIS 10.x that are not available in ArcView 3.x to make the tool more powerful, flexible, and easier to use than AGWA 1.5.

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